Add C++ implementation of Object.defineProperties

src/lookup.h

Index: src/lookup.h
diff --git a/src/lookup.h b/src/lookup.h
index 3888ed624057231fd1d8266363ed6abf888849be..197987d684d73b901dee6582aaeab850f247f532 100644
--- a/src/lookup.h
+++ b/src/lookup.h
@@ -133,16 +133,31 @@ class LookupIterator final BASE_EMBEDDED {
   }
 
   static LookupIterator PropertyOrElement(
-      Isolate* isolate, Handle<Object> receiver, Handle<Name> name,
+      Isolate* isolate, Handle<Object> receiver, Handle<Object> name,
       Configuration configuration = DEFAULT) {
-    name = Name::Flatten(name);
+    DCHECK(name->IsName() || name->IsNumber());
+
     uint32_t index;
-    LookupIterator it =
-        name->AsArrayIndex(&index)
-            ? LookupIterator(isolate, receiver, index, configuration)
-            : LookupIterator(receiver, name, configuration);
-    it.name_ = name;
-    return it;
+    bool is_index = false;
+    if (name->IsNumber()) {
+      if (name->ToArrayIndex(&index)) {
+        is_index = true;
+      } else {
+        name = isolate->factory()->NumberToString(name);
+      }
+    } else {
+      DCHECK(name->IsName());
+      name = Name::Flatten(Handle<Name>::cast(name));
+      is_index = Handle<Name>::cast(name)->AsArrayIndex(&index);
+    }
+    if (is_index) {
+      return LookupIterator(isolate, receiver, index, configuration);
+    } else {
+      DCHECK(name->IsName());
+      LookupIterator it(receiver, Handle<Name>::cast(name), configuration);
+      it.name_ = Handle<Name>::cast(name);
+      return it;
+    }
   }
 
   static LookupIterator PropertyOrElement(